diff options
Diffstat (limited to 'src/cryptsetup')
| -rw-r--r-- | src/cryptsetup/cryptsetup-generator.c | 298 | ||||
| -rw-r--r-- | src/cryptsetup/cryptsetup.c | 529 |
2 files changed, 827 insertions, 0 deletions
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c new file mode 100644 index 0000000000..a48b7a4562 --- /dev/null +++ b/src/cryptsetup/cryptsetup-generator.c @@ -0,0 +1,298 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <string.h> +#include <errno.h> +#include <unistd.h> + +#include "log.h" +#include "util.h" +#include "unit-name.h" + +const char *arg_dest = "/tmp"; + +static bool has_option(const char *haystack, const char *needle) { + const char *f = haystack; + size_t l; + + assert(needle); + + if (!haystack) + return false; + + l = strlen(needle); + + while ((f = strstr(f, needle))) { + + if (f > haystack && f[-1] != ',') { + f++; + continue; + } + + if (f[l] != 0 && f[l] != ',') { + f++; + continue; + } + + return true; + } + + return false; +} + +static int create_disk( + const char *name, + const char *device, + const char *password, + const char *options) { + + char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL; + int r; + FILE *f = NULL; + bool noauto, nofail; + + assert(name); + assert(device); + + noauto = has_option(options, "noauto"); + nofail = has_option(options, "nofail"); + + if (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) { + r = -ENOMEM; + log_error("Failed to allocate unit name."); + goto fail; + } + + if (asprintf(&p, "%s/%s", arg_dest, n) < 0) { + r = -ENOMEM; + log_error("Failed to allocate unit file name."); + goto fail; + } + + if (!(u = fstab_node_to_udev_node(device))) { + r = -ENOMEM; + log_error("Failed to allocate device node."); + goto fail; + } + + if (!(d = unit_name_from_path(u, ".device"))) { + r = -ENOMEM; + log_error("Failed to allocate device name."); + goto fail; + } + + if (!(f = fopen(p, "wxe"))) { + r = -errno; + log_error("Failed to create unit file: %m"); + goto fail; + } + + fprintf(f, + "[Unit]\n" + "Description=Cryptography Setup for %%I\n" + "Conflicts=umount.target\n" + "DefaultDependencies=no\n" + "BindTo=%s dev-mapper-%%i.device\n" + "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n" + "Before=umount.target\n", + d, d); + + if (!nofail) + fprintf(f, + "Before=cryptsetup.target\n"); + + if (password && (streq(password, "/dev/urandom") || + streq(password, "/dev/random") || + streq(password, "/dev/hw_random"))) + fprintf(f, + "After=systemd-random-seed-load.service\n"); + else + fprintf(f, + "Before=local-fs.target\n"); + + fprintf(f, + "\n[Service]\n" + "Type=oneshot\n" + "RemainAfterExit=yes\n" + "TimeoutSec=0\n" /* the binary handles timeouts anyway */ + "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" + "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", + name, u, strempty(password), strempty(options), + name); + + if (has_option(options, "tmp")) + fprintf(f, + "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", + name); + + if (has_option(options, "swap")) + fprintf(f, + "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", + name); + + fflush(f); + + if (ferror(f)) { + r = -errno; + log_error("Failed to write file: %m"); + goto fail; + } + + if (asprintf(&from, "../%s", n) < 0) { + r = -ENOMEM; + goto fail; + } + + if (!noauto) { + + if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) { + r = -ENOMEM; + goto fail; + } + + mkdir_parents(to, 0755); + + if (symlink(from, to) < 0) { + log_error("Failed to create symlink '%s' to '%s': %m", from, to); + r = -errno; + goto fail; + } + + free(to); + to = NULL; + + if (!nofail) + asprintf(&to, "%s/cryptsetup.target.requires/%s", arg_dest, n); + else + asprintf(&to, "%s/cryptsetup.target.wants/%s", arg_dest, n); + + if (!to) { + r = -ENOMEM; + goto fail; + } + + mkdir_parents(to, 0755); + + if (symlink(from, to) < 0) { + log_error("Failed to create symlink '%s' to '%s': %m", from, to); + r = -errno; + goto fail; + } + } + + free(to); + to = NULL; + + e = unit_name_escape(name); + if (asprintf(&to, "%s/dev-mapper-%s.device.requires/%s", arg_dest, e, n) < 0) { + r = -ENOMEM; + goto fail; + } + + mkdir_parents(to, 0755); + + if (symlink(from, to) < 0) { + log_error("Failed to create symlink '%s' to '%s': %m", from, to); + r = -errno; + goto fail; + } + + r = 0; + +fail: + free(p); + free(n); + free(d); + free(e); + + free(from); + free(to); + + if (f) + fclose(f); + + return r; +} + +int main(int argc, char *argv[]) { + FILE *f; + int r = EXIT_SUCCESS; + unsigned n = 0; + + if (argc > 2) { + log_error("This program takes one or no arguments."); + return EXIT_FAILURE; + } + + if (argc > 1) + arg_dest = argv[1]; + + log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); + log_parse_environment(); + log_open(); + + umask(0022); + + if (!(f = fopen("/etc/crypttab", "re"))) { + + if (errno == ENOENT) + r = EXIT_SUCCESS; + else { + r = EXIT_FAILURE; + log_error("Failed to open /etc/crypttab: %m"); + } + + goto finish; + } + + for (;;) { + char line[LINE_MAX], *l; + char *name = NULL, *device = NULL, *password = NULL, *options = NULL; + int k; + + if (!(fgets(line, sizeof(line), f))) + break; + + n++; + + l = strstrip(line); + if (*l == '#' || *l == 0) + continue; + + if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) { + log_error("Failed to parse /etc/crypttab:%u, ignoring.", n); + r = EXIT_FAILURE; + goto next; + } + + if (create_disk(name, device, password, options) < 0) + r = EXIT_FAILURE; + + next: + free(name); + free(device); + free(password); + free(options); + } + +finish: + return r; +} diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c new file mode 100644 index 0000000000..ac7b6d6c38 --- /dev/null +++ b/src/cryptsetup/cryptsetup.c @@ -0,0 +1,529 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <string.h> +#include <errno.h> +#include <sys/mman.h> +#include <mntent.h> + +#include <libcryptsetup.h> +#include <libudev.h> + +#include "log.h" +#include "util.h" +#include "strv.h" +#include "ask-password-api.h" +#include "def.h" + +static const char *opt_type = NULL; /* LUKS1 or PLAIN */ +static char *opt_cipher = NULL; +static unsigned opt_key_size = 0; +static char *opt_hash = NULL; +static unsigned opt_tries = 0; +static bool opt_readonly = false; +static bool opt_verify = false; +static usec_t opt_timeout = DEFAULT_TIMEOUT_USEC; + +/* Options Debian's crypttab knows we don't: + + offset= + skip= + precheck= + check= + checkargs= + noearly= + loud= + keyscript= +*/ + +static int parse_one_option(const char *option) { + assert(option); + + /* Handled outside of this tool */ + if (streq(option, "noauto")) + return 0; + + if (startswith(option, "cipher=")) { + char *t; + + if (!(t = strdup(option+7))) + return -ENOMEM; + + free(opt_cipher); + opt_cipher = t; + + } else if (startswith(option, "size=")) { + + if (safe_atou(option+5, &opt_key_size) < 0) { + log_error("size= parse failure, ignoring."); + return 0; + } + + } else if (startswith(option, "hash=")) { + char *t; + + if (!(t = strdup(option+5))) + return -ENOMEM; + + free(opt_hash); + opt_hash = t; + + } else if (startswith(option, "tries=")) { + + if (safe_atou(option+6, &opt_tries) < 0) { + log_error("tries= parse failure, ignoring."); + return 0; + } + + } else if (streq(option, "readonly")) + opt_readonly = true; + else if (streq(option, "verify")) + opt_verify = true; + else if (streq(option, "luks")) + opt_type = CRYPT_LUKS1; + else if (streq(option, "plain") || + streq(option, "swap") || + streq(option, "tmp")) + opt_type = CRYPT_PLAIN; + else if (startswith(option, "timeout=")) { + + if (parse_usec(option+8, &opt_timeout) < 0) { + log_error("timeout= parse failure, ignoring."); + return 0; + } + + } else if (!streq(option, "none")) + log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option); + + return 0; +} + +static int parse_options(const char *options) { + char *state; + char *w; + size_t l; + + assert(options); + + FOREACH_WORD_SEPARATOR(w, l, options, ",", state) { + char *o; + int r; + + if (!(o = strndup(w, l))) + return -ENOMEM; + + r = parse_one_option(o); + free(o); + + if (r < 0) + return r; + } + + return 0; +} + +static void log_glue(int level, const char *msg, void *usrptr) { + log_debug("%s", msg); +} + +static char *disk_description(const char *path) { + struct udev *udev = NULL; + struct udev_device *device = NULL; + struct stat st; + char *description = NULL; + const char *model; + + assert(path); + + if (stat(path, &st) < 0) + return NULL; + + if (!S_ISBLK(st.st_mode)) + return NULL; + + if (!(udev = udev_new())) + return NULL; + + if (!(device = udev_device_new_from_devnum(udev, 'b', st.st_rdev))) + goto finish; + + if ((model = udev_device_get_property_value(device, "ID_MODEL_FROM_DATABASE")) || + (model = udev_device_get_property_value(device, "ID_MODEL")) || + (model = udev_device_get_property_value(device, "DM_NAME"))) + description = strdup(model); + +finish: + if (device) + udev_device_unref(device); + + if (udev) + udev_unref(udev); + + return description; +} + +static char *disk_mount_point(const char *label) { + char *mp = NULL, *device = NULL; + FILE *f = NULL; + struct mntent *m; + + /* Yeah, we don't support native systemd unit files here for now */ + + if (asprintf(&device, "/dev/mapper/%s", label) < 0) + goto finish; + + if (!(f = setmntent("/etc/fstab", "r"))) + goto finish; + + while ((m = getmntent(f))) + if (path_equal(m->mnt_fsname, device)) { + mp = strdup(m->mnt_dir); + break; + } + +finish: + if (f) + endmntent(f); + + free(device); + + return mp; +} + +static int help(void) { + + printf("%s attach VOLUME SOURCEDEVICE [PASSWORD] [OPTIONS]\n" + "%s detach VOLUME\n\n" + "Attaches or detaches an encrypted block device.\n", + program_invocation_short_name, + program_invocation_short_name); + + return 0; +} + +int main(int argc, char *argv[]) { + int r = EXIT_FAILURE; + struct crypt_device *cd = NULL; + char **passwords = NULL, *truncated_cipher = NULL; + const char *cipher = NULL, *cipher_mode = NULL, *hash = NULL, *name = NULL; + char *description = NULL, *name_buffer = NULL, *mount_point = NULL; + unsigned keyfile_size = 0; + + if (argc <= 1) { + help(); + return EXIT_SUCCESS; + } + + if (argc < 3) { + log_error("This program requires at least two arguments."); + return EXIT_FAILURE; + } + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + + if (streq(argv[1], "attach")) { + uint32_t flags = 0; + int k; + unsigned try; + const char *key_file = NULL; + usec_t until; + crypt_status_info status; + + /* Arguments: systemd-cryptsetup attach VOLUME SOURCE-DEVICE [PASSWORD] [OPTIONS] */ + + if (argc < 4) { + log_error("attach requires at least two arguments."); + goto finish; + } + + if (argc >= 5 && + argv[4][0] && + !streq(argv[4], "-") && + !streq(argv[4], "none")) { + + if (!path_is_absolute(argv[4])) + log_error("Password file path %s is not absolute. Ignoring.", argv[4]); + else + key_file = argv[4]; + } + + if (argc >= 6 && argv[5][0] && !streq(argv[5], "-")) + parse_options(argv[5]); + + /* A delicious drop of snake oil */ + mlockall(MCL_FUTURE); + + description = disk_description(argv[3]); + mount_point = disk_mount_point(argv[2]); + + if (description && streq(argv[2], description)) { + /* If the description string is simply the + * volume name, then let's not show this + * twice */ + free(description); + description = NULL; + } + + if (mount_point && description) + asprintf(&name_buffer, "%s (%s) on %s", description, argv[2], mount_point); + else if (mount_point) + asprintf(&name_buffer, "%s on %s", argv[2], mount_point); + else if (description) + asprintf(&name_buffer, "%s (%s)", description, argv[2]); + + name = name_buffer ? name_buffer : argv[2]; + + if ((k = crypt_init(&cd, argv[3]))) { + log_error("crypt_init() failed: %s", strerror(-k)); + goto finish; + } + + crypt_set_log_callback(cd, log_glue, NULL); + + status = crypt_status(cd, argv[2]); + if (status == CRYPT_ACTIVE || status == CRYPT_BUSY) { + log_info("Volume %s already active.", argv[2]); + r = EXIT_SUCCESS; + goto finish; + } + + if (opt_readonly) + flags |= CRYPT_ACTIVATE_READONLY; + + if (opt_timeout > 0) + until = now(CLOCK_MONOTONIC) + opt_timeout; + else + until = 0; + + opt_tries = opt_tries > 0 ? opt_tries : 3; + opt_key_size = (opt_key_size > 0 ? opt_key_size : 256); + hash = opt_hash ? opt_hash : "ripemd160"; + + if (opt_cipher) { + size_t l; + + l = strcspn(opt_cipher, "-"); + + if (!(truncated_cipher = strndup(opt_cipher, l))) { + log_error("Out of memory"); + goto finish; + } + + cipher = truncated_cipher; + cipher_mode = opt_cipher[l] ? opt_cipher+l+1 : "plain"; + } else { + cipher = "aes"; + cipher_mode = "cbc-essiv:sha256"; + } + + for (try = 0; try < opt_tries; try++) { + bool pass_volume_key = false; + + strv_free(passwords); + passwords = NULL; + + if (!key_file) { + char *text; + char **p; + + if (asprintf(&text, "Please enter passphrase for disk %s!", name) < 0) { + log_error("Out of memory"); + goto finish; + } + + k = ask_password_auto(text, "drive-harddisk", until, try == 0 && !opt_verify, &passwords); + free(text); + + if (k < 0) { + log_error("Failed to query password: %s", strerror(-k)); + goto finish; + } + + if (opt_verify) { + char **passwords2 = NULL; + + assert(strv_length(passwords) == 1); + + if (asprintf(&text, "Please enter passphrase for disk %s! (verification)", name) < 0) { + log_error("Out of memory"); + goto finish; + } + + k = ask_password_auto(text, "drive-harddisk", until, false, &passwords2); + free(text); + + if (k < 0) { + log_error("Failed to query verification password: %s", strerror(-k)); + goto finish; + } + + assert(strv_length(passwords2) == 1); + + if (!streq(passwords[0], passwords2[0])) { + log_warning("Passwords did not match, retrying."); + strv_free(passwords2); + continue; + } + + strv_free(passwords2); + } + + strv_uniq(passwords); + + STRV_FOREACH(p, passwords) { + char *c; + + if (strlen(*p)+1 >= opt_key_size) + continue; + + /* Pad password if necessary */ + if (!(c = new(char, opt_key_size))) { + log_error("Out of memory."); + goto finish; + } + + strncpy(c, *p, opt_key_size); + free(*p); + *p = c; + } + } + + k = 0; + + if (!opt_type || streq(opt_type, CRYPT_LUKS1)) + k = crypt_load(cd, CRYPT_LUKS1, NULL); + + if ((!opt_type && k < 0) || streq_ptr(opt_type, CRYPT_PLAIN)) { + struct crypt_params_plain params; + + zero(params); + params.hash = hash; + + /* In contrast to what the name + * crypt_setup() might suggest this + * doesn't actually format anything, + * it just configures encryption + * parameters when used for plain + * mode. */ + k = crypt_format(cd, CRYPT_PLAIN, + cipher, + cipher_mode, + NULL, + NULL, + opt_key_size / 8, + ¶ms); + + pass_volume_key = streq(hash, "plain"); + + /* for CRYPT_PLAIN limit reads + * from keyfile to key length */ + keyfile_size = opt_key_size / 8; + } + + if (k < 0) { + log_error("Loading of cryptographic parameters failed: %s", strerror(-k)); + goto finish; + } + + log_info("Set cipher %s, mode %s, key size %i bits for device %s.", + crypt_get_cipher(cd), + crypt_get_cipher_mode(cd), + crypt_get_volume_key_size(cd)*8, + argv[3]); + + if (key_file) + k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, keyfile_size, flags); + else { + char **p; + + STRV_FOREACH(p, passwords) { + + if (pass_volume_key) + k = crypt_activate_by_volume_key(cd, argv[2], *p, opt_key_size, flags); + else + k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, *p, strlen(*p), flags); + + if (k >= 0) + break; + } + } + + if (k >= 0) + break; + + if (k != -EPERM) { + log_error("Failed to activate: %s", strerror(-k)); + goto finish; + } + + log_warning("Invalid passphrase."); + } + + if (try >= opt_tries) { + log_error("Too many attempts."); + r = EXIT_FAILURE; + goto finish; + } + + } else if (streq(argv[1], "detach")) { + int k; + + if ((k = crypt_init_by_name(&cd, argv[2]))) { + log_error("crypt_init() failed: %s", strerror(-k)); + goto finish; + } + + crypt_set_log_callback(cd, log_glue, NULL); + + if ((k = crypt_deactivate(cd, argv[2])) < 0) { + log_error("Failed to deactivate: %s", strerror(-k)); + goto finish; + } + + } else { + log_error("Unknown verb %s.", argv[1]); + goto finish; + } + + r = EXIT_SUCCESS; + +finish: + + if (cd) + crypt_free(cd); + + free(opt_cipher); + free(opt_hash); + + free(truncated_cipher); + + strv_free(passwords); + + free(description); + free(mount_point); + free(name_buffer); + + return r; +} |